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        啥都有电商台
        <p class="off active">
            你好
            <a href="./login.html">请登录</a>
        </p>
        <p class="on " >
            你好
            <button>用户昵称</button>
            <button>个人中心</button>
            <button>退出登录</button>
        </p>
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